armstrong



(No Model.)

E. J. ARMSTRONG. PISTON EUR STEAM ENGINES.

Patented Oct. 13 1896.

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75W@ @Mx UNirEn STATES PATENT OEEICE.

EDYIN J. ARMSTRONG, OF OSVEGO, NEW YORK, ASSIGNOR TO TI'IE AMES IRON VORKS, OF SAME PLACE.

Pls-roN Foa STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 569,532, dated October 13, 1896.

Application filed December 26, 1895. Serial No. 573,352. (No model.)

To all whom t may concern: tion of the rod, and when in the desired posi- 55 Be it known that I, EDWIN J. ARMSTRONG, tion the bolts d are inserted in the openings a citizen of the United States, residing at Osor perforations b and screwed into the oppowego, in the county of Oswego and State of site perforations e, the heads of the latter fit- 5 New York, have invented certain new and ting within the countersunk recesses c, and

useful Improvements in Pistons for Stealnupon tightening said bolts the hubs are drawn 6o Engines; and I do hereby declare the followtoward each other to cause them to bind on ing to be a full, clear, and exact description the threads of the rod and effectually preventof the invention, such as will enable others ing the piston working loose.

1o skilled in the art to which it appertains to In Fig. 3 I show a modified form of my inmake and use the same. vention, in which I employ set-screws f to 65 This invention relates generally to pistons force the hubs apart in order to cause them for steamengines, and particularly to the to bind on the threads of the rod. This I acmeans for securing piston-rods thereto, and complish by omitting the perforations from 15 is specially adapted to compound engines of one of the hubs and forming screw-thread the tandem type, and it has for its object to perforations g in the other, with a counter- 7o provide a simple, durable, and secure means sunk recess surrounding the same, into whichV for fastening the pistons to the rod, so as to the setscrews are driven and made to abut provide for their easy adjustment thereon and against the other hub and thus forcing the 2o removal therefrom; andit consists in forming hubs apart and producing practically the apiston withadividedhub, the parts of which same result, although I do not regard it as 75 are adapted to be moved relative to each other desirable a construction as the one first dein order to cause them to clamp or grip the scribed. l rod passing therethrough, as will be herein- It will be observed that the piston above 2 5 after more fully described and claimed. described is easily removable from and readily In the accompanying drawings, forming a adjustable longitudinally on its rod and that 8o part of this specification, Figure l is a vertithe same may be securely fastened to the rod cal cross-section through my improved piston 5 in its proper position after adj ustmentthereto. Fig. 2, a side elevation of the same; and Fig. Having thus described my invention, what 3o 3 a vertical section of a piston, showing a I claim as new, and desire to secure by Letters modied form of adjusting the hubs. Patent, is-- 85 Similar letters refer to similar parts in all l. The combination, with a screw-threaded the views. piston-rod, of a piston having a split or di- Arepresents my improved piston,which,as vided hub formed with a screw-threaded 3 5 clearly shown, is cast hollow and with its hub opening for the piston-rod, and means for B divided or formed in two parts, threaded springing the parts or halves of said hub in 9o as one, to receive the screw-threaded portion opposite directions, whereby the piston may o, of a piston-rod C. Through the hubs are be clamped on the rod, substantially as deformed perforations in line with each other, scribed.

4o the perforations b of one hub being blank or 2. A piston cast with two hubs having a unthreaded and countersunk, as at c, to rescrew-threaded opening fora piston-rod, and 95 ceive the unthreaded portion and head of a perforations formed in one of said hubs and bolt d therein, the perforations e of the other corresponding screw threaded perforations hub b eing screw threaded to receive the formed in the other, and bolts for springing 45 threaded portion of said bolt d. saidhubs toward each other, whereby the pis- It is desirable in some cases that the pistons ton may be clamped on a piston-rod, substanroo be easily removable from their rods, and partially as described.

ticularly soin tandem engines, where also lon- In testimony whereof I aiiix my signature gitudinal adjustment of the pistons on the in presence of two witnesses. 5o piston-rods is a desirable feature. My inven- EDXVIN el ARMSTRONG tion possesses both these features and at the same time insures the perfect security of the lVitnesses:

fastening of the pistons and rods together. J. F. BEALE,

The piston is secured on the threaded por- II. M. STERLING. 

